When using normalized dispersion method for the dispersion design of photonic crystal fibers (PCFs), it is vital that the group velocity dispersion of PCF can be seen as the sum of geometrical dispersion and material dispersion. However, the error induced by this way of calculation will deteriorate the final results. Taking 5 ps/(km·nm) and 5% as absolute error and relative error limits, respectively, the structure parameter boundaries of PCFs about when separating total dispersion into geometrical and material components is valid are provided for wavelength shorter than 1700 nm. By using these two criteria together, it is adequate to evaluate the simulated dispersion of PCFs when normalized dispersion method is employed.
© 2009 Chinese Optics Letters
(060.2310) Fiber optics and optical communications : Fiber optics
(060.4005) Fiber optics and optical communications : Microstructured fibers
(060.5295) Fiber optics and optical communications : Photonic crystal fibers
Wei Wang, Lantian Hou, Zhaolun Liu, and Guiyao Zhou, "Validity condition of separating dispersion of PCFs into material dispersion and geometrical dispersion," Chin. Opt. Lett. 7, 768-770 (2009)